Celestron 11007 Betriebsanweisung PDF herunterladen (Seite 67)

18 I The Celestron EdgeHD

The spot matrix shows that on-axis images are diffraction

limited at all three wavelengths, and remain diffraction-limited

over the central 15mm. While blue and red are slightly enlarged,

in green light images are fully diffraction-limited over a 38mm

image circle. The size of the off-axis blue and red spots remain

nicely balanced.

On a night of average seeing, stars will display a FWHM of

23μm, comparable in size to the spot pattern at the very edge

of a 42mm ﬁeld. Relative illumination in the EdgeHD 925 is

excellent. The central 12mm is completely free of vignetting,

while ﬁeld edges receive 90% relative illumination. For most

imaging applications, ﬂat ﬁelding would be optional.

For full-ﬁeld imaging on a tight budget, the EdgeHD 925 is an

excellent choice. It offers nearperfect on-axis performance and

outstanding images over a full 42mm image circle.

Celestron EdgeHD 925

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Celestron 11007 Betriebsanweisung Seite 67